<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<style>
		div{
			width: 200px;
			height: 100px;
			/*background-color: rgb(0,255,255);*/
			/*background-color: rgba(0,0,0,.6);*/
			background: #999;
		}
	</style>
</head>
<body>
	<div></div>
	
</body>
</html>